<template>
  <div>
    <!-- 代表一行可以放多个表单元素 -->
    <el-form :inline="true" class="demo-form-inline" :model="cForm">
      <el-form-item label="一级分类">
        <!-- 将选中的值放到表单里面 -->
        <el-select placeholder="请选择" v-model="cForm.category1Id" @change="handler1" :disabled="show">
          <el-option :label="c1.name" :value="c1.id" v-for="(c1,index) in list1" :key="c1.id"></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="二级分类">
        <el-select placeholder="请选择" value="" v-model="cForm.category2Id" @change="handler2" :disabled="show">
          <el-option :label="c2.name" :value="c2.id" v-for="(c2,index) in list2" :key="c2.id"></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="三级分类">
        <el-select placeholder="请选择" value="" v-model="cForm.category3Id" @change="handler3" :disabled="show">
          <el-option :label="c3.name" :value="c3.id" v-for="(c3,index) in list3" :key="c3.id"></el-option>
        </el-select>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
export default {
  name: 'CategorySelect',
  data () {
    return {
      // 一级分类的数据
      list1: [],
      // 收集相应的一级二级分类的id
      cForm: {
        category1Id: '',
        category2Id: '',
        category3Id: '',
      },
      list2: [],
      list3: []
    }
  },
  // 组件挂载完毕，需要获取一级分类数据
  mounted () {
    this.getCategory1List();
  },
  methods: {
    async getCategory1List () {
      let result = await this.$API.Attr.reqCategory1List()
      if (result.code == 200) {
        this.list1 = result.data
      }
    },
    // 一级分类的select事件的回调(当一级分类的option改变后。重新发起请求，获取二级分类的数据)
    async handler1 () {
      // 清除数据
      this.list2 = []
      this.list3 = []
      this.cForm.category2Id = ''
      this.cForm.category3Id = ''
      // 解构出一级分类的数据
      const { category1Id } = this.cForm
      this.$emit('getCategoryId', { categoryId: category1Id, level: 1 })
      let result = await this.$API.Attr.reqCategory2List(category1Id)
      if (result.code == 200) {
        this.list2 = result.data
      }
    },
    // 二级分类事件的回调
    async handler2 () {
      this.list3 = []
      this.cForm.category3Id = ''
      const { category2Id } = this.cForm
      this.$emit('getCategoryId', { categoryId: category2Id, level: 2 })
      let result = await this.$API.Attr.reqCategory2List(category2Id)
      if (result.code == 200) {
        this.list3 = result.data
      }
    },
    // 三级分类事件的回调
    handler3 () {
      // 获取三级分类的id
      const { category3Id } = this.cForm
      this.$emit('getCategoryId', { categoryId: category3Id, level: 3 })
    }
  },
  props: ['show']
}
</script>

<style>
</style>